标签:c enums mapping entity-framework-5 ef-model-first
由于我已经切换到.net 4.5和EF 5.0,我已经开始使用枚举映射.
在我的项目中,我首先使用模型.因为所有的枚举都是早先声明的,所以当我在EDM中将字段转换为枚举时,我决定使用选项“引用外部类型”.一切正常,但是当我尝试执行代码时
public enum SomeEnum : int
{
value1 = 0,
value2 = 1
}
class Program
{
static void Main(string[] args)
{
TestDbEntities context = new TestDbEntities();
var enumList = new List<SomeEnum>() { SomeEnum.value1, SomeEnum.value2 };
var items = context.Table1.Where(e => enumList.Contains(e.EnumField));
foreach (var item in items)
{
Console.Write(item.Id);
}
context.Dispose();
}
}
我收到带有消息的ArgumentException:
The type 'SomeEnum' does not match the EDM enumeration type 'SomeEnum' or its underlying type 'Int32' Parameter name: value.
有线的是,当我不使用引用外部类型时,一切都很好.我理解EDM背后的原因,但我无法理解为什么这个代码在模型中定义枚举后由T4生成
<EntityContainer Name="TestDbEntities" p1:LazyLoadingEnabled="true">
<EntitySet Name="Table1" EntityType="TestDbModel.Table1" />
</EntityContainer>
<EntityType Name="Table1">
<Key>
<PropertyRef Name="Id" />
<PropertyRef Name="EnumField" />
</Key>
<Property Name="Id" Type="Int32" Nullable="false" />
<Property Name="EnumField" Type="TestDbModel.SomeEnum" Nullable="false" />
</EntityType>
<EnumType Name="SomeEnum" a:ExternalTypeName="ConsoleApplication1.SomeEnum" xmlns:a="http://schemas.microsoft.com/ado/2006/04/codegeneration" />
我想使用引用外部类型,但这是一些限制.我知道我可以转换为基础类型,但这是一个黑客.
– – 编辑
这是一个堆栈跟踪
at System.Data.Common.CommandTrees.ExpressionBuilder.Internal.ArgumentValidation.ValidateConstant(TypeUsage constantType, Object value)
at System.Data.Objects.ELinq.ExpressionConverter.ConstantTranslator.TypedTranslate(ExpressionConverter parent, ConstantExpression linq)
at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator`1.Translate(ExpressionConverter parent, Expression linq)
at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq)
at System.Data.Objects.ELinq.ExpressionConverter.NewArrayInitTranslator.<>c__DisplayClass88.<TypedTranslate>b__86(Expression e)
at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()
at System.Data.Common.CommandTrees.ExpressionBuilder.Internal.EnumerableValidator`3.Validate(IEnumerable`1 argument, String argumentName, Int32 expectedElementCount, Boolean allowEmpty, Func`3 map, Func`2 collect, Func`3 deriveName)
at System.Data.Common.CommandTrees.ExpressionBuilder.Internal.EnumerableValidator`3.Validate()
at System.Data.Common.CommandTrees.ExpressionBuilder.Internal.ArgumentValidation.CreateExpressionList(IEnumerable`1 arguments, String argumentName, Boolean allowEmpty, Action`2 validationCallback)
at System.Data.Common.CommandTrees.ExpressionBuilder.Internal.ArgumentValidation.ValidateNewCollection(IEnumerable`1 elements, DbExpressionList& validElements)
at System.Data.Common.CommandTrees.ExpressionBuilder.DbExpressionBuilder.CreateNewCollection(IEnumerable`1 elements)
at System.Data.Objects.ELinq.ExpressionConverter.NewArrayInitTranslator.TypedTranslate(ExpressionConverter parent, NewArrayExpression linq)
at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator`1.Translate(ExpressionConverter parent, Expression linq)
at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq)
at System.Data.Objects.ELinq.ExpressionConverter.ConstantTranslator.TypedTranslate(ExpressionConverter parent, ConstantExpression linq)
at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator`1.Translate(ExpressionConverter parent, Expression linq)
at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq)
at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.ContainsTranslator.TranslateContains(ExpressionConverter parent, Expression sourceExpression, Expression valueExpression)
at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.ContainsTranslator.Translate(ExpressionConverter parent, MethodCallExpression call)
at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.SequenceMethodTranslator.Translate(ExpressionConverter parent, MethodCallExpression call, SequenceMethod sequenceMethod)
at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.TypedTranslate(ExpressionConverter parent, MethodCallExpression linq)
at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator`1.Translate(ExpressionConverter parent, Expression linq)
at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq)
at System.Data.Objects.ELinq.ExpressionConverter.TranslateLambda(LambdaExpression lambda, DbExpression input)
at System.Data.Objects.ELinq.ExpressionConverter.TranslateLambda(LambdaExpression lambda, DbExpression input, DbExpressionBinding& binding)
at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.OneLambdaTranslator.Translate(ExpressionConverter parent, MethodCallExpression call, DbExpression& source, DbExpressionBinding& sourceBinding, DbExpression& lambda)
at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.OneLambdaTranslator.Translate(ExpressionConverter parent, MethodCallExpression call)
at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.SequenceMethodTranslator.Translate(ExpressionConverter parent, MethodCallExpression call, SequenceMethod sequenceMethod)
at System.Data.Objects.ELinq.ExpressionConverter.MethodCallTranslator.TypedTranslate(ExpressionConverter parent, MethodCallExpression linq)
at System.Data.Objects.ELinq.ExpressionConverter.TypedTranslator`1.Translate(ExpressionConverter parent, Expression linq)
at System.Data.Objects.ELinq.ExpressionConverter.TranslateExpression(Expression linq)
at System.Data.Objects.ELinq.ExpressionConverter.Convert()
at System.Data.Objects.ELinq.ELinqQueryState.GetExecutionPlan(Nullable`1 forMergeOption)
at System.Data.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption)
at System.Data.Objects.ObjectQuery`1.System.Collections.Generic.IEnumerable<T>.GetEnumerator()
at System.Data.Entity.Internal.Linq.InternalQuery`1.GetEnumerator()
at System.Data.Entity.Infrastructure.DbQuery`1.System.Collections.Generic.IEnumerable<TResult>.GetEnumerator()
at ConsoleApplication1.Program.Main(String[] args) in c:\Users\Pawel\Documents\Visual Studio 2012\Projects\ClassLibrary1\ConsoleApplication1\Program.cs:line 22
at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()
解决方法:
这是一个错误.我在EntityFramework Codeplex网站上提交了它:http://entityframework.codeplex.com/workitem/623.现在解决方法是使用||或者在EDM枚举类型中指定CLR枚举类型中的所有成员.
设置外部枚举类型会向EDM枚举类型(a:ExternalTypeName =“ConsoleApplication1.SomeEnum”)添加注释,该类型告诉代码gen不生成此类型,但在生成的代码中使用该属性的值,使用该类型.如果没有此注释,将生成与EDM枚举类型完全匹配的CLR枚举.顺便说一句.不久前我在EF5和外部枚举类型上写了一篇博文.你可以在这里找到它:http://blog.3d-logic.com/2012/09/11/using-exisiting-enum-types-in-entity-framework-5/.我将在博客上添加有关bug的信息.随意评论它.
标签:c,enums,mapping,entity-framework-5,ef-model-first 来源: https://codeday.me/bug/20190529/1181087.html
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